<script setup>
import { ref, computed } from 'vue'
import Product from '@/components/Product.vue';
import { useCartStore } from '@/stores/cart.js'
import router from '../../router';

const cart = useCartStore()
const props = defineProps(['shopName'])
// 是否显示购物车
const showCart = ref(false)
// 当前店铺购物车
const shopCart = computed(() => {
    return cart.cartList.find(item => item.name == props.shopName)
})
// 购物车商品列表
const shopCartList = computed(() => {
    if(shopCart.value) {
        return shopCart.value.list
    }else {
        return []
    }  
})
// 购物车商品数量
const cartListCount = computed(() => {
    if(shopCart.value) {
        return shopCart.value.list.reduce((sum, product) => sum += product.number, 0)
    }else {
        return 0
    }
})
// 被选中商品列表
const  checkedShopCartList = computed(() => {
    if(shopCart.value) {
        return shopCart.value.list.filter(item => item.checked)
    }else {
        return []
    }  
})
// 被选中商品数量
const checkedCartListCount = computed(() => {
    if(shopCart.value) {
        return checkedShopCartList.value.reduce((sum, product) => sum += product.number, 0)
    }else {
        return 0
    }
})
// 总计
const totalPrice = computed(() => {
    if(shopCart.value) {
        return checkedShopCartList.value.reduce((sum, product) => sum += product.number*product.price, 0).toFixed(2)
    }else {
        return 0
    }
})
// 全选
const allChecked = computed({
    get() {
        // every
        // 每一个元素都符合条件，返回true，否则返回false
     return shopCartList.value.every(item => item.checked)
    },
    set(newValue) {
        shopCartList.value.forEach(item => item.checked = newValue)
    }  
})
// 清空购物车
const clearCart = () => {
    // 清空购物车中商品数量
    shopCart.value.list.forEach(item => item.number = 0)
    // 移除购物车
    cart.cartList = cart.cartList.filter(item => item != shopCart.value)
}
// 确定订单
const gotoOrderConfirmation = () => {
    router.push({path: '/orderconfirmation', query: {shopName: shopCart.value.name}})
}
</script>

<template>
    <div class="cart">
        <div class="cart_mask" v-if="showCart" @click="showCart = !showCart"></div>
        <div class="cart_product" v-if="showCart">
            <div class="cart_product_header" v-if="cartListCount > 0">
                <div class="cart_product_header_allChecked">
                    <input type="checkbox" class="circle-checkbox" v-model="allChecked" name="" id=""> 全选
                </div>
                <div class="cart_product_header_clear" @click="clearCart">清空购物车</div>
            </div>
            <div class="cart_product_list">
                <div class="cart_product_list_item" v-for="item in shopCartList" :key="item.title">
                    <div class="checkbox">
                        <!-- <input type="checkbox" class="circle-checkbox" :checked="item.checked" @change="changeChecked(item)" name="" id=""> -->
                        <input type="checkbox" class="circle-checkbox" v-model="item.checked">
                    </div>
                    <div class="content">
                        <Product :shopName="props.shopName" :product="item" min="min" />
                    </div>
                </div>
            </div>
        </div>
        <div class="cart_check">
            <div class="cart_check_icon" @click="showCart = !showCart">
                <img src="http://www.dell-lee.com/imgs/vue3/basket.png" alt="">
                <span class="tag" v-if="checkedCartListCount > 0">{{ checkedCartListCount }}</span>
            </div>
            <div class="cart_check_empty" v-if="cartListCount == 0">购物车是空的</div>
            <div class="cart_check_content" v-else>
                <div class="cart_check_content_total_price">总计 : <span class="check_content_total_price_number">￥{{ totalPrice }}</span></div>
                <div class="cart_check_content_submit" @click="gotoOrderConfirmation">结算</div>
            </div>
        </div>
    </div>
</template>

<style lang="scss" scoped>
@import "@/style/viriables.scss";
.cart {
    &_mask {
        position: absolute;
        top: 0;
        bottom: .5rem;
        left: 0;
        right: 0;
        background-color: rgba($color: #000000, $alpha: .4);
    }

    &_product {
        width: 100%;
        position: absolute;
        left: 0;
        bottom: .5rem;
        background-color: $bgColor;

        //圆形复选框
        /* 设置选中背景 */
        .circle-checkbox:checked {
            background: #1673ff;
        }

        /* 设置复选框样式 */
        .circle-checkbox {
            width: .2rem;
            height: .2rem;
            background-color: #ffffff;
            border: solid 1px $light-fontColor;
            -webkit-border-radius: 50%;
            border-radius: 50%;
            font-size: 0.8rem;
            margin: 0;
            padding: 0;
            position: relative;
            display: inline-block;
            vertical-align: top;
            cursor: default;
            -webkit-appearance: none;
            -webkit-user-select: none;
            user-select: none;
        }

        /* 设置伪类，即显现的对勾样式 */
        .circle-checkbox:checked::after {
            content: "";
            top: 5px;
            left: 4px;
            position: absolute;
            background: transparent;
            border: #fff solid 2px;
            border-top: none;
            border-right: none;
            height: 3px;
            width: 8px;
            -moz-transform: rotate(-45deg);
            -ms-transform: rotate(-45deg);
            -webkit-transform: rotate(-45deg);
            transform: rotate(-45deg);
        }

        &_header {
            padding: .18rem;
            display: flex;
            justify-content: space-between;
        }

        &_list {
            max-height: 3rem;
            overflow-y: scroll;

            &_item {
                display: flex;

                .checkbox {
                    display: flex;
                    align-items: center;
                    margin-left: .18rem;  
                }

                .content {
                    flex: 1;
                    width: 100%;
                }
            }
        }
    }

    &_check {
        width: 100%;
        height: .49rem;
        border-top: .01rem solid $content-bgColor;
        position: absolute;
        left: 0;
        bottom: 0;
        display: flex;
        // 购物车图标
        &_icon {
            width: .84rem;
            height: .49rem;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
            img {
                 width: .28rem;
                height: .26rem;
            }

            .tag {
                display: inline-block;
                width: .15rem;
                height: .15rem;
                border-radius: 50%;
                background-color: $hightlight-fontColor;
                color: $bgColor;
                font-size: .1rem;
                text-align: center;
                position: absolute;
                top: .05rem;
                right: .18rem;
            }
           
        }
        // 空购物车
        &_empty {
            line-height: .49rem;
        }
        // 总价
        &_content {
            flex: 1;
            display: flex;
            position: relative;
            width: 100%;

            &_total_price {
                flex: 1;
                line-height: .49rem;
                color: $hightlight-fontColor;

                &_number {
                    font-size: .18rem;
                }
            }
            &_submit {
                width: .98rem;
                height: .49rem;
                background-color: $btn-bgColor;
                color: $bgColor;
                text-align: center;
                line-height: .49rem;
            }
        }
    }
}
</style>